Islamabad: Pakistan on Friday condemned the burning of Qurans at the biggest US military base in Afghanistan, an incident that has fuelled violent protests in the neighbouring country claiming 14 lives.

"The government and the people of Pakistan condemn the desecration of the holy Quran in the strongest possible terms," Foreign Office spokesman Abdul Basit told a weekly news briefing in response to a question.

"The US has apologised at the highest level and assured of a full enquiry. It is absolutely important that such utterly irresponsible and reprehensible acts do not recur," he said.

The US-led military coalition in Afghanistan has acknowledged that several Qurans were sent by mistake to a garbage burn pit at Bagram Air Field near Kabul on February 19.

Two American soldiers are among the 14 people who have died in violent protests over the incident.

US President Barack Obama on Thursday apologised for the burning of the Qurans in a letter to Afghan President Hamid Karzai.

"The error was inadvertent; I assure you that we will take the appropriate steps to avoid any recurrence, to include holding accountable those responsible," Karzai's office quoted Obama as saying.

Following the incident, the Taliban called on Afghans to retaliate against the US-led troops in Afghanistan.

There have also been small protests by hardline religious groups in some cities of Pakistan.